Like say if GTA 3 was missing the scarface soundtrack licensing, would you be ok with buying one CD or iTunes Album and running a script that fixes that problem?

No. First off it’s down to the user to fix their issues. Second you would end up paying more for soundtrack plus game.
But it’s irrelevant, R* are not coming here, ever.
Just buy a disc ply and disc image it, then you have a digital copy of the full product.

Yes. I can listen to my own music.

Depends on the game. I would find it absurd to buy a crippled version of a game in a sale only for the missing licensed soundtrack to cost 2-3x more on another store than the game itself, and if there was a script that could add those missing WAV / MP3 files in, then a lot of people would just grab them off Youtube and not feel guilty when they were sold an inferior / crippled version of the game in the first place.

The beauty of GOG's offline installers though, is that once you have them backed up, nothing can be remotely forcibly removed (unlike what Steam pulled with GTA IV's soundtrack) that was only possible due to Steam's DRM.

Rockstar and 2K are quite rich. They can afford to keep paying the music licenses for their games.

If a track gets removed and I already own the track from an album - as long as they keep their MP3 station there in their games, I'll just toss it there in that game-folder.

I would just find the disc version of the game and buy that. If not possible, buy the game, ignore it, and then proceed to pirate the superior version of the game.

Cases like these are ones where I am perfectly OK with piracy.

Tons of games have made changes I didn't like with post-release patches. The beauty of offline installers is that you don't have to update ever, if you don't like the changes.

If the price is less than the version that had the soundtrack (or they're both low and/or released at good discounts), I might buy GTA:SA here to support GOG (not the re-release that Steam got, though that should be sold here too as an option), assuming the original soundtrack can be modded back in. I know there'd be wailing and gnashing of teeth but I'd rather GOG got GTAs here than not.

No, but not because of the music. I just think GTA sucks.

Yeah. I wasn't interested in that licensed crap anyway. There ain't a single Freddie Mercury listed among the artists!

I'd rather have Allister Brimble, Jeff Briggs, Len Lagace, Roland J. Rizzo, David Govett, Laura Barratt, John Broomhall, Richard Wells, Kenneth W. Arnold, Herman Miller, Todd Mitchell Porter, David R. Watson compose the music.

Cannot buy the games anyway as they are not sold here.

I still have my retail copies of GTA3, VC, SA.

I have GTA3; VC; SA; GTA4: Complete Edition on Steam.

I have GTA5 from Rockstar Social Club/Game Launcher.